Hi and welcome! My name is XXXXX XXXXX I will be assisting you. I am happy to help.
The overall answer is you have to follow the laws of each local jurisdiction
and the federal laws; as well as international law (I am sure you know this already).
For example, here is a link about animals in circuses and the laws that govern them:
Here is a link to each states' law regarding exotic animals:
Here is a link about UK and exotic animals:
Here is a link to the Maine statute addressing traveling shows:
With regard to minors, for example, Maine states that
Minors Who are 16 or 17: May work in nonhazardous jobs in manufacturing establish-ments, bakeries, laundries, drycleaning establishments and garages. They may also work in hotels; motels; commercial places of amusement, including skating rinks, circuses, arcades, bowling alleys and pool halls; and in all of the industries allowed for younger minors.
Here is a link to US child labor laws regarding child entertainment:
So, as you can see, you have a lot of work cut out for you. You need to have an attorney (or yourself) spend time (a few hours) initially and on an on going basis to make sure you are following the laws in each jurisdiction.
If you need clarification, or need to clarify your answer, or have a follow up question, please let me know.
Thank you, Damien